EP2221545A1 - Four de cuisson doté d'un accumulateur thermique latent - Google Patents

Four de cuisson doté d'un accumulateur thermique latent Download PDF

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Publication number
EP2221545A1
EP2221545A1 EP10000107A EP10000107A EP2221545A1 EP 2221545 A1 EP2221545 A1 EP 2221545A1 EP 10000107 A EP10000107 A EP 10000107A EP 10000107 A EP10000107 A EP 10000107A EP 2221545 A1 EP2221545 A1 EP 2221545A1
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EP
European Patent Office
Prior art keywords
latent heat
muffle
heat
fan
heat storage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10000107A
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German (de)
English (en)
Inventor
Hansjörg ROHR
Jürg Werner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
V-Zug AG
Original Assignee
V-Zug AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by V-Zug AG filed Critical V-Zug AG
Priority to EP10000107A priority Critical patent/EP2221545A1/fr
Publication of EP2221545A1 publication Critical patent/EP2221545A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/34—Elements and arrangements for heat storage or insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation

Definitions

  • the invention relates to an oven, in particular a household oven, according to the preamble of claim 1.
  • the object of the invention is a further reduction of the energy consumption of a baking oven.
  • the device according to the invention is therefore equipped with a subcoolable latent heat accumulator, ie a latent heat accumulator which has two phase states, eg solid and liquid, whereby the first phase state associated with the higher temperature range can be subcooled well below the phase transition temperature, preferably below room temperature (ie below 20 ° C), so that it is able to store the latent heat even at room temperature.
  • a subcoolable latent heat accumulator ie a latent heat accumulator which has two phase states, eg solid and liquid, whereby the first phase state associated with the higher temperature range can be subcooled well below the phase transition temperature, preferably below room temperature (ie below 20 ° C), so that it is able to store the latent heat even at room temperature.
  • the apparatus comprises heat coupling means for selectively thermally coupling the muffle to the latent heat storage and thereby bringing the latent heat storage by heat from the muffle from the second (lower) to the first (higher) phase state.
  • heat coupling means for selectively thermally coupling the muffle to the latent heat storage and thereby bringing the latent heat storage by heat from the muffle from the second (lower) to the first (higher) phase state.
  • selective is understood to mean that the heat coupling means can be activated and deactivated, wherein they cause a higher thermal coupling between muffle and latent heat storage in the activated state than in the deactivated state.
  • the device also has an initiator for triggering the phase transition of the latent heat storage device from the first phase state back to the second phase state when the latent heat storage device is undercooled. This makes it possible to selectively release the latent heat at a desired time.
  • the device according to the invention it is thus possible to convey part of the heat from the muffle area into the latent heat store by activating the heat coupling means after the end of a baking process, when the muffle area is still warm, but the heat is no longer needed there.
  • the muffle area is cooled and stored at the same time the energy as latent heat.
  • the initiator can then be activated to release the latent heat. This is at least partially transferred by the heat coupling means back into the muffle area in order to heat it.
  • the heat coupling means are deactivated and the muffle is further heated by a conventional heater.
  • the heat coupling means may comprise a drive movable part having a first and a second position. In the first position he thermally couples the muffle better with the latent heat storage than in the second position.
  • the latent heat accumulator is connected to the movable part and is moved together with this.
  • the movable member forms a wall for the latent heat storage, which in the first position abuts the muffle and is spaced therefrom in the second position.
  • the heat coupling means comprise air conveying means, for example a fan or a fan, with which selectively (i.e., on and off) air between muffle and latent heat storage can be promoted.
  • the heat coupling means can be formed by a heat pump.
  • a heat pump This has the advantage that a greater part of the heat energy can be promoted from the muffle area to the latent heat store and from the latent heat store to the muffle area.
  • the heat pump can be operated in two directions, so that either heat from the muffle to the latent heat storage or the latent heat storage can be promoted to muffle.
  • a drive 10 which is coupled via a shaft 11 with the fan 6 and this drives.
  • the latent heat accumulator 12 is based on a "phase change material” (PCM), which undergoes a phase transition at a phase transition temperature Tc, which preferably above 50 ° C and below 200 ° C. lies, so it with the residual heat of typical oven temperatures can be melted. Furthermore, the material should be allowed to be subcooled to at least room temperature, so that the latent heat can be stored until the next use. Finally, the crystallization of the supercooled material or the transition from the first (higher) phase state to the second (deeper) phase state must be able to be specifically triggered so that the latent heat can be conveyed back to the muffle area at the right time. For this purpose, an initiator 13 is provided.
  • PCM phase change material
  • phase change material sodium acetate trihydrate (melting point 58 ° C)
  • im U.S. Patent 5,728,316 mentioned mixture of magnesium nitrate hexahydrate Mg (NO3) 2 ⁇ 6 H2O with lithium nitrate LiNO3 (melting point 75.6 ° C) and similar mixtures known from EP 1 087 003 or potassium aluminum dodecylhydrate (melting point 92 ° C) are used, and the other in EP 689,024 and EP 1 186 838 mentioned materials.
  • Most materials of this type use a solid-liquid phase transition. However, the nature of the phase transition plays a minor role in the present context. It is crucial that the latent heat storage can be brought by heating in the first phase state with thermal coupling to the muffle and then subcooled.
  • a mechanical initiator can be used, which is designed, for example, in the manner of a "cracking frog", ie as a metal plate, which changes its configuration when force is applied.
  • the initiator is connected to an electromagnetic actuator that can actuate the initiator.
  • initiators by ultrasound, pressure, chemical initiators as nucleating agents and electrical initiators with which the crystallization is initiated directly by applying a voltage, cf. eg EP 689,024 and EP 1 186 838 ,
  • the heat pump itself can also be used as an initiator by cooling the heat exchanger of the heat pump connected to the latent heat accumulator 12 to such a low temperature that the transition from the first to the second phase state spontaneously.
  • the latent heat storage is movably arranged and can be moved by a drive 15.
  • the drive can be formed for example by a wax switch or a bimetallic drive, or by a controlled by the control of the device electromagnet.
  • the latent heat accumulator 12 In his first position, which in Fig. 1 is shown, the latent heat accumulator 12 is at a distance from the muffle or from the rear wall of the fan chamber 5 and thus has a significantly lower temperature than that which prevails in the oven 3.
  • the region 16, in which the latent heat accumulator 12 is located is ventilated by a fan (not shown) in order to keep the temperature of the latent heat accumulator 12 below the phase transition temperature Tc.
  • the latent heat accumulator 12 is moved by the drive 15 against the muffle and preferably against the impeller 6, until it rests against the wall of the muffle 2 and the fan chamber 5.
  • the heat coupling means mentioned above are thus formed by the wall 18, which closes the latent heat accumulator 12 against the front, as well as by the drive 15th
  • the fan 6 can be turned off. The device can now continue to cool down.
  • the latent heat storage 12 initially remains in the in Fig. 2 shown first position.
  • the initiator 13 is activated and triggers the transition of the latent heat accumulator 12 from the first to the second phase state. This latent heat is released.
  • the fan 6 is in operation, so that the liberated latent heat can be dissipated and introduced into the oven 3.
  • the latent heat storage 12 with the drive 15 back into the in Fig. 1 shown second position. Now the baking chamber 3 can be further heated if necessary with the normal heating.
  • these air conveying means are formed by the fan 6 and a shutter mechanism 20, 21.
  • the shutter mechanism 20, 21 either the blow-off 8 can be opened, through which the air from the fan chamber 5 flows directly back into the oven 3, or auxiliary openings 23 in the rear wall of the fan chamber 5, through which the air from the fan 6 to the latent heat storage 12 and can be funded from there via a return channel 24 back into the oven 3.
  • the promoted by the fan 6 air can be optionally performed by the latent heat storage 12.
  • the locking mechanism comprises e.g. a first perforated plate 20 and a second perforated plate 21, which are arranged at the front and rear walls of the fan chamber 5.
  • the perforated plates 20, 21 can be displaced via a suitable drive (not shown) so that they alternatively close the blow-off openings 8 or the auxiliary openings 23.
  • the closing mechanism is inserted in the Fig. 4 shown position in which the blow-off 8 closed, but the auxiliary openings 23 are open.
  • the fan 6 promotes air from the oven 3 through the suction openings 7 and the auxiliary openings 23 through ventilation ducts 25 of the latent heat accumulator 12, from where the air is passed through the return channel 24 back into the oven. This heat from the muffle area in the latent heat storage 12 so that it can be brought into the first phase state.
  • the fan 6 can be turned off.
  • the closing mechanism initially remains in the in Fig. 4 shown position.
  • the initiator 13 is activated and triggers the transition of the latent heat accumulator 12 from the first to the second phase state. This latent heat is released.
  • the fan 6 is in operation, so that the liberated latent heat can be dissipated and introduced via the return channel 24 into the oven 3.
  • the closing mechanism is returned to the in Fig. 3 shown position. Now the baking chamber 3 can be further heated if necessary with the normal heating.
  • the air in the in Fig. 4 It is conceivable, however, also to arrange the auxiliary openings 23 in the radially inner region of the fan wheel 6 and to make the suction openings 7 of the closure mechanism 20, 21 lockable, so that the air from the fan 6 can be sucked through the heat exchanger and then blown directly into the oven 3.
  • the heat coupling means comprises a heat pump.
  • a heat pump This may be, for example, a Peltier element, a diffusion heat pump or, as in Fig. 5 shown to act a conventional heat pump with compressor, evaporator and condenser.
  • the heat pump comprises a compressor 30, which can be operated in two conveying directions. It is arranged in a circuit with a first heat exchanger 31, an expansion valve 32 and a second heat exchanger 33. There is a heat pump medium in the circuit.
  • the first heat exchanger 31 is thermally connected to the muffle 2, in the present embodiment, by being arranged on the rear wall of the fan chamber 5.
  • the second heat exchanger 33 is thermally connected to the latent heat storage 12.
  • the compressor 30 If the compressor 30 is operated so that the heat pump medium is first conveyed into the first heat exchanger 31, then through the expansion valve 32 and finally through the second heat exchanger 33, the first heat exchanger 31 operates as a condenser and the second heat exchanger 33 as an evaporator and it can Heat from the latent heat storage 12 are promoted to the muffle area.
  • the compressor 30 If the compressor 30, however, operated so that the heat pump medium is first in the second heat exchanger 33, then conveyed through the expansion valve 32 and finally through the first heat exchanger 31, the second heat exchanger 33 operates as a condenser and the first heat exchanger 31 as an evaporator and it Heat from the muffle area to the latent heat storage 12 can be promoted.
  • the compressor 30 is off during the high temperature phase of a baking process.
  • the latent heat accumulator 12 is thus thermally insulated from the muffle area.
  • the compressor 30 may also be operated during the high-temperature phase so that it promotes heat from the latent heat storage 12 to the muffle 2, whereby the latent heat storage 12 is cooled and the muffle 2 is heated, whereby the effect the electric Muffelbetropicung supported at least and the outer space of the muffle can be cooled.
  • the compressor 30 is operated so that it first conveys the heat pump medium in the second heat exchanger 33, whereby heat from the muffle region to the latent heat storage 12 is promoted, so that the latent heat storage 12 can be brought into the first phase state.
  • the fan 6 is in operation to bring the heat from the oven 3 to the first heat exchanger 31. Thanks to the temperature lift generated by the heat pump, the latent heat accumulator 12 can be brought into the first (higher) phase state even when the muffle temperature is below the phase transition temperature Tc.
  • the compressor 30 can be turned off.
  • the compressor 30 is operated so that heat is supplied from the latent heat storage 12 to the muffle area.
  • the initiator 13 is activated and triggers the transition of the latent heat accumulator 12 from the first to the second phase state. (Alternatively, as already mentioned, the transition may also be initiated when the second heat exchanger 33 is cooled by the heat pump to a sufficiently low temperature.)
  • latent heat is released.
  • the fan 6 is in operation, so that the heat emitted from the first heat exchanger 31 heat can be dissipated in the oven 3.
  • the compressor 30 can be switched off. Now the baking chamber 3 can be further heated if necessary with the normal heating.
  • the heat pump can also be used be used to further warm the baking chamber.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP10000107A 2010-01-08 2010-01-08 Four de cuisson doté d'un accumulateur thermique latent Withdrawn EP2221545A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10000107A EP2221545A1 (fr) 2010-01-08 2010-01-08 Four de cuisson doté d'un accumulateur thermique latent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10000107A EP2221545A1 (fr) 2010-01-08 2010-01-08 Four de cuisson doté d'un accumulateur thermique latent

Publications (1)

Publication Number Publication Date
EP2221545A1 true EP2221545A1 (fr) 2010-08-25

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EP10000107A Withdrawn EP2221545A1 (fr) 2010-01-08 2010-01-08 Four de cuisson doté d'un accumulateur thermique latent

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EP (1) EP2221545A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2466219A1 (fr) * 2010-12-17 2012-06-20 Miele & Cie. KG Appareil de cuisson et procédé de fonctionnement d'un appareil de cuisson
DE102011088092A1 (de) * 2011-12-09 2013-06-13 BSH Bosch und Siemens Hausgeräte GmbH Backofen mit einem Latentwärmespeicher sowie Verfahren zum Betreiben eines Backofens
DE102012208433A1 (de) 2012-05-21 2013-11-21 BSH Bosch und Siemens Hausgeräte GmbH Gargerät
DE102012208440A1 (de) 2012-05-21 2013-11-21 BSH Bosch und Siemens Hausgeräte GmbH Gargerät
WO2021028541A1 (fr) * 2019-08-15 2021-02-18 Sunphase As Four électrique chauffé à capacité de stockage de chaleur

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0689024A1 (fr) 1994-06-21 1995-12-27 Toyota Jidosha Kabushiki Kaisha Accumulateur de chaleur
US5728316A (en) 1991-01-10 1998-03-17 Merck Patent Gesellschaft Mit Beschrankter Haftung Salt mixtures for storing thermal energy in the form of that of phase transformation
DE19757415C1 (de) * 1997-12-23 1999-04-08 Rational Gmbh Gargerät mit Wärmerückführung
DE19824172A1 (de) * 1998-05-29 1999-12-09 Rational Gmbh Gargerät mit Energiespeicher- und Energieentnahmesystem
EP1087003A2 (fr) 1999-09-25 2001-03-28 MERCK PATENT GmbH Mélanges de sels accumulateurs d'énergie thermique sous forme de chaleur de changement de phase et leur application
EP1186838A2 (fr) 2000-09-06 2002-03-13 National Institute of Advanced Industrial Science and Technology Rechauffeur à accumulation et procédé de regulation
WO2006029597A1 (fr) * 2004-09-13 2006-03-23 Rational Ag Accumulateur thermique et appareil de cuisson comprenant un accumulateur thermique de ce type
DE102006007379A1 (de) * 2006-02-17 2007-08-30 Rational Ag Gargerät mit Combi-Dämpfer, Pizzaofen und Energiespeicher
EP1936285A1 (fr) * 2006-12-07 2008-06-25 Rational AG Appareil de cuisson avec accumulateur de chaleur et pprocédé d'utilisation

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5728316A (en) 1991-01-10 1998-03-17 Merck Patent Gesellschaft Mit Beschrankter Haftung Salt mixtures for storing thermal energy in the form of that of phase transformation
EP0689024A1 (fr) 1994-06-21 1995-12-27 Toyota Jidosha Kabushiki Kaisha Accumulateur de chaleur
DE19757415C1 (de) * 1997-12-23 1999-04-08 Rational Gmbh Gargerät mit Wärmerückführung
DE19824172A1 (de) * 1998-05-29 1999-12-09 Rational Gmbh Gargerät mit Energiespeicher- und Energieentnahmesystem
EP1087003A2 (fr) 1999-09-25 2001-03-28 MERCK PATENT GmbH Mélanges de sels accumulateurs d'énergie thermique sous forme de chaleur de changement de phase et leur application
EP1186838A2 (fr) 2000-09-06 2002-03-13 National Institute of Advanced Industrial Science and Technology Rechauffeur à accumulation et procédé de regulation
WO2006029597A1 (fr) * 2004-09-13 2006-03-23 Rational Ag Accumulateur thermique et appareil de cuisson comprenant un accumulateur thermique de ce type
DE102006007379A1 (de) * 2006-02-17 2007-08-30 Rational Ag Gargerät mit Combi-Dämpfer, Pizzaofen und Energiespeicher
EP1936285A1 (fr) * 2006-12-07 2008-06-25 Rational AG Appareil de cuisson avec accumulateur de chaleur et pprocédé d'utilisation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2466219A1 (fr) * 2010-12-17 2012-06-20 Miele & Cie. KG Appareil de cuisson et procédé de fonctionnement d'un appareil de cuisson
DE102010061300A1 (de) * 2010-12-17 2012-06-21 Miele & Cie. Kg Gargerät und Verfahren zum Betreiben eines Gargerätes
DE102011088092A1 (de) * 2011-12-09 2013-06-13 BSH Bosch und Siemens Hausgeräte GmbH Backofen mit einem Latentwärmespeicher sowie Verfahren zum Betreiben eines Backofens
DE102012208433A1 (de) 2012-05-21 2013-11-21 BSH Bosch und Siemens Hausgeräte GmbH Gargerät
DE102012208440A1 (de) 2012-05-21 2013-11-21 BSH Bosch und Siemens Hausgeräte GmbH Gargerät
WO2021028541A1 (fr) * 2019-08-15 2021-02-18 Sunphase As Four électrique chauffé à capacité de stockage de chaleur

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